Iso 12944-2 - Parte 2 36206

INTERNATIONAL STANDARD

ISO 12944-2

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First edition 1998-05-15

Paints and varnishes — Corrosion protection of steel structures by protective paint systems Part 2: Classification of environments Peintures et vernis — Anticorrosion des structures en acier par systèmes de peinture — Partie 2: Classification des environnements

A

Reference number ISO 12944-2:1998(E)

ISO 12944-2:1998(E)

This is a free 4 page sample. Access the full version online.

Contents

Page

1

Scope .........................................................................................

1

2

Normative references .................................................................

1

3

Definitions ...................................................................................

2

4

Corrosion stresses due to the atmosphere, water and soil ........

3

5

Classification of environments ...................................................

4

Annexes A

Climatic conditions .....................................................................

6

B

Special cases .............................................................................

7

© ISO 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 • CH-1211 Genève 20 • Switzerland Internet [email protected] Printed in Switzerland

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©

ISO

ISO 12944-2:1998(E)

This is a free 4 page sample. Access the full version online.

Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and nongovernmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 12944-2 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 14, Corrosion protection of steel structures by protective paint systems. ISO 12944 consists of the following parts, under the general title Paints and varnishes — Corrosion protection of steel structures by protective paint systems:

— Part 1: General introduction — Part 2: Classification of environments — Part 3: Design considerations — Part 4: Types of surface and surface preparation — Part 5: Protective paint systems — Part 6: Laboratory performance test methods — Part 7: Execution and supervision of paint work — Part 8: Development of specifications for new work and maintenance Annexes A and B of this part of ISO 12944 are for information only.

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ISO 12944-2:1998(E)

©

ISO

Introduction

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Unprotected steel in the atmosphere, in water and in soil is subject to corrosion that may lead to damage. Therefore, to avoid corrosion damage, steel structures are normally protected to withstand the corrosion stresses during the service life required of the structure. There are different ways of protecting steel structures from corrosion. ISO 12944 deals with protection by paint systems and covers, in the various parts, all features that are important in achieving adequate corrosion protection. Additional or other measures are possible but require particular agreement between the interested parties. In order to ensure effective corrosion protection of steel structures, it is necessary for owners of such structures, planners, consultants, companies carrying out corrosion protection work, inspectors of protective coatings and manufacturers of coating materials to have at their disposal state-ofthe-art information in concise form on corrosion protection by paint systems. Such information has to be as complete as possible, unambiguous and easily understandable to avoid difficulties and misunderstandings between the parties concerned with the practical implementation of protection work. This International Standard — ISO 12944 — is intended to give this information in the form of a series of instructions. It is written for those who have some technical knowledge. It is also assumed that the of ISO 12944 is familiar with other relevant International Standards, in particular those dealing with surface preparation, as well as relevant national regulations. Although ISO 12944 does not deal with financial and contractual questions, attention is drawn to the fact that, because of the considerable implications of inadequate corrosion protection, non-compliance with requirements and recommendations given in this standard may result in serious financial consequences. ISO 12944-1 defines the overall scope of all parts of ISO 12944. It gives some basic and definitions and a general introduction to the other parts of ISO 12944. Furthermore, it includes a general statement on health, safety and environmental protection, and guidelines for using ISO 12944 for a given project. This part of ISO 12944 describes the environmental impact on steel structures. It covers structures exposed to the atmosphere as well as those immersed in water or buried in soil. For different atmospheric environments, a classification system based on corrosivity categories is presented. Different environments for immersed and buried structures are also described. All these environments are relevant to the choice of protective paint systems.

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ISO 12944-2:1998 Paints and varnishes Corrosion protection of steel structures by protective paint systems - Part 2: Classification of environments

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